I have a 27" core i3 imac with the ATI 5670 Graphics card and for the life of me I cant get the fans to speed up! It actually annoys me because i feel like the iMac is not working as hard as possible. I have currently been running 5 yes > /dev/null"s in terminal for 30 min and the cpu fan is still at 939rpm and the cpu temp is staying at 60C. I even tried doing that while running World of Warcraft on ultra settings and still the fans did not speed up. I've read a lot of overheating iMac threads but never a non-overheaing iMac thread...So i want to hear from you guys if your iMac doesn't overheat. I just want to see how many good iMac's are out there.